Grille Mould Tool

Sometimes there will be sharp edges and thin steel bulges at mold surface caused by tooling design or the part configuration mostly. They are sharp like blade which is harmful and vulnerable to deflect after molten resin impacts again and again. So how to deal with these problems?
 

Problem: radiator grill parting surface has big vertical drop, for which there will be thin steel convex on the mould surface, not tough enough and easy to break down at bottom.
Solution: to make sure these thin steel parts of both fixed and moved half are even in thickness and keep kiss-off side a pocket for 0.3mm space to avoid stress at side area.

Problem: As the grille strip areas cause high thin steel structure, whose toughness is not enough, there will be elastic deformation and increasing shear stress at the bottom.
Solution: To set up convex platform reducing thickness at non primary viewing area.

Problem: there is sharp edge kiss-off at corner for this product, the sharp edge area is easy to wear and brings flashes and shortens the grille mould tool span life.
Solution: To add part wall thickness at certain partial area so that the sharp edge thin steel kiss-off problem at little corner can be solved.

Problem 1: This clip will cause the tool surface thin steel structure and its width face get involved in kiss-off, whose angle is only 1 degree, which means the thin steel bottom will get big shear stress thus easy to break down.
Solution: to increase little wall thickness to get the thin steel area out of kiss-off.

Problem 2: The thin steel part height 7.6mm and width 2.5mm, whose width face get involved in kiss-off with angle of only 1 degree, which is easy to crack.
Solution: under the condition that thin steel thickness can not be increased, we think to do optimization for the length to get involved in kiss-off with angle over 5 degree.

Problem: part structure feature like this the width spotting surface has the angle which occurs shear stress.
Solution: to make the top spotting surface even so as to have the thin steel bottom get rid of crack from periodic shear stress; to make R chamfer for the bottom.

Solution: to put in factors of relative polymer molding stress; thin steel length, width and height; Young's Modulus( Tensile Modulus) to calculate thin steel part deflection value with deflection limit value by formula.

 

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